Battery charger



FIG. 1 is a perspective view with lid open;

FIG. 2 is a perspective view with lid closed;

FIG. 3 is a front elevation view;

FIG. 4 is a rear elevation view;

FIG..5 is a left side elevation view;

FIG. 6 is a right side elevation view;

FIG. 7 is a top view; and,

FIG. 8 is a bottom view. 

CLAIM The ornamental design for a battery charger, as shown and described. 